These are custom CSS properties and a custom shorthand (likely part of a design system) used to control an animation. Explanation:
- -sd-animation: sd-fadeIn;
- Purpose: selects a named animation (here, “sd-fadeIn”) defined elsewhere (either via @keyframes or in the design system).
- Effect: tells the component which animation to run.
- –sd-duration: 250ms;
- Purpose: sets the animation duration (250 milliseconds).
- Usage: typically applied to animation-duration or transition-duration (e.g., animation-duration: var(–sd-duration);).
- –sd-easing: ease-in;
- Purpose: sets the timing function for the animation.
- Usage: plugged into animation-timing-function (e.g., animation-timing-function: var(–sd-easing);).
How they work together (typical implementation)
- Define keyframes:
@keyframes sd-fadeIn {from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: translateY(0); }} - Apply properties on a component:
.component { animation-name: var(–sd-animation); animation-duration: var(–sd-duration); animation-timing-function: var(–sd-easing); animation-fill-mode: both;}
Notes and tips
- These are custom properties; ensure fallbacks if not set: animation-duration: var(–sd-duration, 300ms);
- Prefixing: -sd-animation (with single leading hyphen) is unusual — custom properties normally use –. If -sd-animation is not a CSS variable, it may be a custom property for a JS framework; prefer –sd-animation for standard CSS variables.
- Ensure the keyframes name matches exactly the value.
- Combine with prefers-reduced-motion: respect user preferences by disabling or reducing duration when reduced motion is set
If you want, I can generate a ready-to-use snippet implementing this with prefers-reduced-motion and sensible defaults.*
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